4. Geometrical instruments
  5. Straight-line light ray type
  6. Celestial
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Columnar sundial

Geometrical instruments – Straight-line light ray type – Celestial
Patent

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Compass

Geometrical instruments – Straight-line light ray type – Celestial
Patent

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Compass including means for displaying constellation data

Geometrical instruments – Straight-line light ray type – Celestial
Patent

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Cylindrical sundial with installation indicia

Geometrical instruments – Straight-line light ray type – Celestial
Patent

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